Fix reporting of TouchToFirstScroll latency metrics

ui/events/latency_info.h

Index: ui/events/latency_info.h
diff --git a/ui/events/latency_info.h b/ui/events/latency_info.h
index 22e1ab4ecfea3641a98a9d5c9a9c4f0f99035307..89ed3096b77f1138349f13382e48755a1f88dcb4 100644
--- a/ui/events/latency_info.h
+++ b/ui/events/latency_info.h
@@ -67,6 +67,8 @@ enum LatencyComponentType {
   // Timestamp of when the gpu service began swap buffers, unlike
   // INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT which measures after.
   INPUT_EVENT_GPU_SWAP_BUFFER_COMPONENT,
+  // Timestamp of when the scroll update gesture from a mouse wheel event.

[tdresser, 2016/04/22 17:55:59]

Comment is missing a verb or two.

[dtapuska, 2016/04/22 18:15:00]

Done.

+  INPUT_EVENT_LATENCY_GENERATE_SCROLL_UPDATE_FROM_MOUSE_WHEEL,
   // ---------------------------TERMINAL COMPONENT-----------------------------
   // TERMINAL COMPONENT is when we show the latency end in chrome://tracing.
   // Timestamp when the mouse event is acked from renderer and it does not
@@ -97,7 +99,7 @@ enum LatencyComponentType {
   // but the swap failed.
   INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
   LATENCY_COMPONENT_TYPE_LAST =
-    INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
+      INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT,
 };
 
 class EVENTS_BASE_EXPORT LatencyInfo {